So there we have it: biscuit hunters, film extras and therapy patients.

For all the combination therapy patients, two-year survival was achieved by 64 per cent.

And at 29 weeks, 62 per cent of the wake therapy patients were symptom-free, compared to 38 per cent of those in the exercise group.

In a study of electroconvulsive shock therapy patients, memories formed at least four years prior to treatment were unaffected, while more recent ones were impaired.

In rare instances, hyperbaric oxygen therapy patients have had seizures.